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設A=a^2-2a+6 B=2a^2-a+4 則A+B=3a^2-3a+10 ∴4AB-(A+B)²; =4AB-A²;-2AB-B²; =-(A-B)²; =-(a^2-2a+6-2a^2+a-4)²; =-(-a²;-a+2)²; =-(a²;+a-2)²; =-(a+2)²;(a-1)²;
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